CVE-2026-20274 PUBLISHED

Cisco IOS XR Software Security Hardening Release: September 2026

Assigner: cisco
Reserved: 08.10.2025 Published: 02.09.2026 Updated: 03.09.2026

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening releases that address multiple internally discovered vulnerabilities.

The vulnerabilities tracked by CVE-2026-20274 are related to improper resource control issues that are grouped under the Common Weakness Enumeration (CWE) CWE-664.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS Score: 9.8

Product Status

Vendor Cisco
Product Cisco IOS XR Software
Versions Default: unknown
  • Version 6.5.29 is affected
  • Version 7.0.1 is affected
  • Version 6.5.26 is affected
  • Version 6.5.25 is affected
  • Version 6.5.28 is affected
  • Version 6.5.90 is affected
  • Version 7.1.1 is affected
  • Version 7.0.90 is affected
  • Version 6.7.1 is affected
  • Version 7.0.2 is affected
  • Version 7.1.15 is affected
  • Version 7.2.1 is affected
  • Version 7.1.2 is affected
  • Version 6.7.2 is affected
  • Version 7.0.11 is affected
  • Version 7.0.12 is affected
  • Version 7.0.14 is affected
  • Version 7.1.25 is affected
  • Version 7.2.12 is affected
  • Version 7.3.1 is affected
  • Version 7.1.3 is affected
  • Version 6.7.3 is affected
  • Version 7.4.1 is affected
  • Version 7.2.2 is affected
  • Version 6.7.4 is affected
  • Version 6.5.31 is affected
  • Version 7.3.15 is affected
  • Version 7.3.16 is affected
  • Version 6.8.1 is affected
  • Version 7.4.15 is affected
  • Version 6.5.32 is affected
  • Version 7.3.2 is affected
  • Version 7.5.1 is affected
  • Version 7.4.16 is affected
  • Version 7.3.27 is affected
  • Version 7.6.1 is affected
  • Version 7.5.2 is affected
  • Version 7.8.1 is affected
  • Version 7.6.15 is affected
  • Version 7.5.12 is affected
  • Version 7.8.12 is affected
  • Version 7.3.3 is affected
  • Version 7.7.1 is affected
  • Version 6.8.2 is affected
  • Version 7.3.4 is affected
  • Version 7.4.2 is affected
  • Version 6.7.35 is affected
  • Version 6.9.1 is affected
  • Version 7.6.2 is affected
  • Version 7.5.3 is affected
  • Version 7.7.2 is affected
  • Version 6.9.2 is affected
  • Version 7.9.1 is affected
  • Version 7.10.1 is affected
  • Version 7.8.2 is affected
  • Version 7.5.4 is affected
  • Version 6.5.33 is affected
  • Version 7.8.22 is affected
  • Version 7.7.21 is affected
  • Version 7.9.2 is affected
  • Version 7.3.5 is affected
  • Version 7.5.5 is affected
  • Version 7.11.1 is affected
  • Version 7.9.21 is affected
  • Version 7.10.2 is affected
  • Version 24.1.1 is affected
  • Version 7.6.3 is affected
  • Version 7.3.6 is affected
  • Version 7.5.52 is affected
  • Version 7.11.2 is affected
  • Version 24.2.1 is affected
  • Version 24.1.2 is affected
  • Version 24.2.11 is affected
  • Version 24.3.1 is affected
  • Version 24.4.1 is affected
  • Version 24.2.2 is affected
  • Version 7.8.23 is affected
  • Version 7.11.21 is affected
  • Version 24.2.20 is affected
  • Version 24.3.2 is affected
  • Version 24.4.10 is affected
  • Version 6.5.35 is affected
  • Version 25.1.1 is affected
  • Version 24.4.2 is affected
  • Version 24.3.20 is affected
  • Version 24.4.15 is affected
  • Version 25.2.1 is affected
  • Version 6.5.351 is affected
  • Version 25.1.2 is affected
  • Version 24.3.30 is affected
  • Version 25.3.1 is affected
  • Version 6.5.352 is affected
  • Version 24.4.30 is affected
  • Version 24.2.21 is affected
  • Version 25.4.1 is affected
  • Version 25.2.2 is affected
  • Version 25.2.15 is affected
  • Version 7.2.0 is affected
  • Version 7.0.0 is affected
  • Version 25.2.30 is affected
  • Version 6.5.353 is affected
  • Version 26.1.1 is affected
  • Version 25.1.30 is affected
  • Version 25.3.15 is affected
  • Version 26.2.100 is affected
  • Version 25.4.2 is affected
  • Version 26.2.1 is affected
  • Version 25.4.30 is affected
  • Version 26.1.2 is affected
  • Version 25.4.201 is affected
  • Version 26.2.101 is affected

Exploits

The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.

References

Problem Types

  • Improper Control of a Resource Through its Lifetime cwe